I thought I would give an update on the success of the clear coat.The small plugs were given 2 coats of D2T and sent down to 100' and no cracking:). the large plugs were given 10 coats of CSI clear coat and sent down to 50' and all survived. I sent one down to 80' and it blew the paint up.I must have had a bad spot on it.
Since then I have started to make a few more of the large plugs and will coat them with D2T
Thanks again to the members of this site.